The duchess gave a speech in London to mark the special new collection.
REUTERS

The duchess accessorized with a pair of earrings previously owned by her late mother-in-law, Princess Diana, according to royal correspondent Rebecca English, who was in attendance at the event.

"I think it's really key in this day and age to remember it's not just about the people that you know you're supporting, it's about the people that you don't know, that you may never know, you may never meet," she said of the collection.

The royal has partnered with fashion brand Jigsaw, designer Misha Nonoo, and British retailers Marks & Spencer and John Lewis to release a collection of women's workwear — and all the proceeds will go to a good cause.

For every item purchased from the collection, another will be donated to Smart Works, a charity which aims to equip women with the essentials to get back into the workplace.

The collection will be available to purchase "for at least 2 weeks," according to Buckingham Palace. Items have already started selling out online.

"As women, it is 100% our responsibility, I think, to support and uplift each other, to champion each other as we aim to succeed, to not set each other up for failure but instead to really be there rallying around each other and say, 'I want to help you,'" she added.

"And you may not ever meet that person, but you'll know when you put on that blazer, or that shirt, or you carry that tote, or put on those trousers, that dress — that some other woman on the other side of this country is wearing that piece because you made that purchase."